/*
 * ResourceURLContent.java 9 juil. 2007
 *
 * Sweet Home 3D, Copyright (c) 2007 Emmanuel PUYBARET / eTeks <info@eteks.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
package com.eteks.sweethome3d.tools;

import java.net.MalformedURLException;
import java.net.URL;

/**
 * URL content read from a class resource.
 * @author Emmanuel Puybaret
 */
public class ResourceURLContent extends URLContent
{
	private static final long serialVersionUID = 1L;
	
	private boolean multiPartResource;
	
	/**
	 * Creates a content for <code>resourceName</code> relative to <code>resourceClass</code>.
	 * @param resourceClass the class relative to the resource name to load
	 * @param resourceName  the name of the resource
	 * @throws IllegalArgumentException if the resource doesn't match a valid resource.
	 */
	public ResourceURLContent(Class<?> resourceClass, String resourceName)
	{
		this(resourceClass, resourceName, false);
	}
	
	/**
	 * Creates a content for <code>resourceName</code> relative to <code>resourceClass</code>.
	 * @param resourceClass the class relative to the resource name to load
	 * @param resourceName  the name of the resource
	 * @param multiPartResource  if <code>true</code> then the resource is a multi part resource 
	 *           stored in a folder with other required resources
	 * @throws IllegalArgumentException if the resource doesn't match a valid resource.
	 */
	public ResourceURLContent(Class<?> resourceClass, String resourceName, boolean multiPartResource)
	{
		super(getClassResource(resourceClass, resourceName));
		if (getURL() == null)
		{
			throw new IllegalArgumentException("Unknown resource " + resourceName);
		}
		this.multiPartResource = multiPartResource;
	}
	
	/**
	 * Creates a content for <code>resourceName</code> relative to <code>resourceClassLoader</code>.
	 * <code>resourceName</code> is absolute and shouldn't start with a slash.
	 * @param resourceClassLoader the class loader used to load the given resource name
	 * @param resourceName  the name of the resource
	 * @throws IllegalArgumentException if the resource doesn't match a valid resource.
	 */
	public ResourceURLContent(ClassLoader resourceClassLoader, String resourceName)
	{
		super(resourceClassLoader.getResource(resourceName));
		if (getURL() == null)
		{
			throw new IllegalArgumentException("Unknown resource " + resourceName);
		}
	}
	
	private static final boolean isJava1dot5dot0_16 = System.getProperty("java.version").startsWith("1.5.0_16");
	
	/**
	 * Returns the URL of the given resource relative to <code>resourceClass</code>.
	 */
	private static URL getClassResource(Class<?> resourceClass, String resourceName)
	{
		URL defaultUrl = resourceClass.getResource(resourceName);
		// Fix for bug #6746185
		// http://bugs.sun.com/view_bug.do?bug_id=6746185
		if (isJava1dot5dot0_16 && defaultUrl != null && "jar".equalsIgnoreCase(defaultUrl.getProtocol()))
		{
			String defaultUrlExternalForm = defaultUrl.toExternalForm();
			if (defaultUrl.toExternalForm().indexOf("!/") == -1)
			{
				String fixedUrl = "jar:"
						+ resourceClass.getProtectionDomain().getCodeSource().getLocation().toExternalForm() + "!/"
						+ defaultUrl.getPath();
				
				if (!fixedUrl.equals(defaultUrlExternalForm))
				{
					try
					{
						return new URL(fixedUrl);
					}
					catch (MalformedURLException ex)
					{
						// Too bad: keep defaultUrl
					}
				}
			}
		}
		return defaultUrl;
	}
	
	/**
	 * Creates a content for <code>resourceUrl</code>. 
	 * @param url  the URL of the resource
	 */
	public ResourceURLContent(URL url, boolean multiPartResource)
	{
		super(url);
		this.multiPartResource = multiPartResource;
	}
	
	/**
	 * Returns <code>true</code> if the resource is a multi part resource stored 
	 * in a folder with other required resources.
	 */
	public boolean isMultiPartResource()
	{
		return this.multiPartResource;
	}
}
